The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 17, 2018
Filed:
Apr. 25, 2013
Expanite Technology A/s, Hillerød, DK;
Thomas Lundin Christiansen, Frederikssund, DK;
Thomas Strabo Hummelshoj, Frederiksberg, DK;
Marcel A. J. Somers, Billund, DK;
EXPANITE TECHNOLOGY A/S, Hillerod, DK;
Abstract
A method for method for solution hardening of a cold deformed workpiece of a passive alloy containing at least 10% chromium, which method includes dissolving at least nitrogen in the workpiece at a temperature T1, which is higher than the solubility temperature for carbide and/or nitride and lower than the melting point of the passive alloy, wherein dissolution of nitrogen at temperature T1 is performed to obtain a diffusion depth in the range of 50 μm to 5 mm, and cooling the workpiece after the dissolution step at temperature T1 to a temperature which is lower than the temperature at which carbides and/or nitrides form in the passive alloy, wherein the cooling step takes place in an inert gas not containing nitrogen. Further, a member, such as a lock washer for securing bolts or nuts prepared using the method.